<template>
    <div>
        <!-- 顶部滑动条区域 -->
        <div id="slider" class="mui-slider">
                    <div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
                        <div class="mui-scroll">
                            <a :class="['mui-control-item', item.id == 0 ? 'mui-active' : '']" v-for="item in cates" :key="item.id" @tap="getPhotoListByCateId(item.id)">
                                {{ item.title }}
                            </a>
                        </div>
                    </div>
        </div>
        <!-- 图片列表区域 -->
        <ul  class="photo-list">
            <router-link :to="'/home/photoinfo/' + item.id" v-for="item in list" :key="item.id" tag="li">
                <img v-lazy="item.img_url">
                <div class="info">
                    <h1 class="info-title">{{ item.title }}</h1>
                    <div class="info-body">{{ item.zhaiyao }}</div>
                </div>
            </router-link>
        </ul>
    </div>
</template>

<script>
    //1.导入mui的js文件
    import mui from "../../lib/mui/js/mui.min.js"
    export default {
        data () {
            return {
                 cates: [],
                 list: []
            }
        },
        created() {
            this. getAllCategory ();
            this.getPhotoListByCateId(0);
        },
        mounted () {
             // 当 组件中的DOM结构被渲染好并放到页面中后，会执行这个 钩子函数
            // 如果要操作元素了，最好在 mounted 里面，因为，这里时候的 DOM 元素 是最新的
            // 2. 初始化滑动控件
            mui(".mui-scroll-wrapper").scroll({
            deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
            });
        },
        methods: { 
            getAllCategory (){
                 this.$http.get("api/getimgcategory").then(result => {
                    if (result.body.status == 0) {
                    result.body.message.unshift({ title: "全部", id: 0 });
                    this.cates = result.body.message;
                    } else {
                    Toast("加载轮播图失败");
                    }
                });
            },
            getPhotoListByCateId(cateId) {
                 this.$http.get("api/getimages/"+ cateId).then(result => {
                    if (result.body.status == 0) {
                    this.list = result.body.message;
                    } else {
                    Toast("加载轮播图失败");
                    }
                });
            }
        }
    }
</script>

<style lang="scss" scoped>
* { touch-action: pan-y; } 
.photo-list {
  list-style: none;
  margin: 0;
  padding: 10px;
  padding-bottom: 0;
  li {
    background-color: #ccc;
    text-align: center;
    margin-bottom: 10px;
    box-shadow: 0 0 9px #999;
    position: relative;
    img {
      width: 100%;
      vertical-align: middle;
    }
    img[lazy="loading"] {
      width: 40px;
      height: 300px;
      margin: auto;
    }

    .info {
      color: white;
      text-align: left;
      position: absolute;
      bottom: 0;
      background-color: rgba(0, 0, 0, 0.4);
      max-height: 84px;
      .info-title {
        font-size: 14px;
      }
      .info-body {
        font-size: 13px;
      }
    }
  }
}
</style>

